According to the template documentation there is an input helper to make a submit button.  One of the examples is:

{{input type='submit' name='submit' id='submit-button'}}

If I insert that exact line into my new_community_post_page.hbs replacing the basic submit button, I get this in the source code when loading it:

Why doesn't the id come over, and why does the name change?

I have tried this in the comments for articles and posts as well, and all follow this behavior.

I am using the Copenhagen v2 theme with some customization, but I cannot see where my changes affected this.